Core-forming apparatus



March 25, 1930. T. H. BROWN CORE FORMING APPARATUS` Filed oc't. 2e, 192e 2 Sheets-Sheet l ffm March 25,- 1930.

T. H. BRowN CORE FORMING APPARATUS 2 Sheets-Sheet 2 Filed Oct. 26. 1926 Patented Mar. 25, 1930 UNITED STATES PATENT OFFICER THOMAS HAROLD BROWN, or' LANSDOWNE `EOROiUGH, PENNSYLVANIA, 'AssIGNoR BY MESNE ASSIGNMENTS, To NATIONAL sAsH WEIGHT CORPORATION, OF BALTIMORE,A MARYLAND, A CORPORATION OE MARYLAND Y CORE-FORMING APPARATUS Application filed October 26, 1,926. Serial No. 144,208.

reproduction on the castings, as sash weights,

formed by the use thereof. The core-box proper preferably consists of a block containing a plurality of aligned cavities, and the core apertures and characters are formed by complementary tapered molding .bars inserted through lateral apertures on opposite sides of the core box and assembled in gangs for ready manipulation together. The character bearing bars are vprovided with stops permitting accurate positioning thereof and preventing inadvertent displacement and the complementary `bars rwedge the character bearing bars into proper position.

By my improvements, I am enabled to provide a portable multiple core kbox with cooperating gangs of character bearing bars and wedging bars and to effect the manipulation of such gangs as units by `utilizing as handles the crossbars connecting together the members of the respective gangs.L I also secure accurate positioning in the box cavities of the characters on the moulding bars of one gang by the provision of limiting stops detachably locked in place by the'molding bars of the other gang; and the position-v ing and retent-ion of the molding bars of each rgang relatively to one another and to the lateral apertures of the boxes is attained by an improved method of assembly and attachment Of parts.- As a result of my improve-- ments, a sand blowing machine may be utilized for supplying and packing sand in the core box, the output of cores is greatly increased, the quality of the cores greatly improved, and there is less breakage and damage than where single cavity core boxes are used in cooperation with anchored moulding bars.

The characteristic features and advantages of my improvements will further appear from the following description and the accompanying drawings in illustration of a preferred embodiment of my invention.

In the accompanying drawings, Fig. l, is a top plan view of a core-box and moulding bars assembled in accordance with my invention; Fig. 2 is a side elevation ofthe core box and character-'bearing bars and wedgmg rods in position; the cross-piece Or connector of the wedging elements and the sc-rews-therefor being shown detached from their normal relation to illustrate themanner of the assembly thereof; Fig. 3 is an end elevation of the assembled core-box andy moldingbars; Fig. 4 1isy a longitudinal section through the corebox with the molding bars in place on the line view on the line 5 5 OfFig. 1; Fig. 6 is a bottom plan View of the assembly shown vin Fig. l; and Fig. 7 is a perspective view of vone of the group of cores proved core-box.

In lts preferred form, my invention is formed by my im.-

bodied in a singlepiece core box preferably formed of a block orcasting 11 containing a series of 'pairs of core-cavities 12, evenly spaced in the box and separated vby webs 13.A ,For lightness, the bottom of the box may consist of a pair of longitudinally extending 'ribs 14; side-concavities l5 may be formed between the bosses 'or supports 16. which are aligned vertically with the top vof the casting, and concavities 18 Vmaybe formed in the end walls 17 ,from which project handles 20. The

box may rest upon the longitudinal ribs as a standor support, and be conveniently manipulated bythe handles 20, but it is manifest that the exterior contour of the box is of relacharacter D impressed upon thevsurface E thereof by mold-ing bars comprising tapered character bearing bars 22 and cooperating wedge members 23.

Ihe molding bars are inserted into the'cavities 12from opposite sides Of the box through openings 24 cut or formed through the mem- 4 4 of Fig. l; Fig. 5 is a transverse sectional 27 thereon. Each such bar is tapered so that its flat character-bearing face 28 and its flat lower face 30 diverge toward the end of the bar opposite the lug 27 where it terminates in a laterally enlarged tang` 36 for connection with a cross piece or handle 31. The upper surfaces 28 of the bars have Yformed in relief thereon characters 32arranged for location substantially in the centers of core cavities when the bars are 'properly positioned. Each stop 27 is spaced the width of the box from the lug 33 formed on each bar and the characters 32 are so located on the bar that when the stops andv lugs engage the opposite` sides of the box the characters are accurately positioned relative each core cavity.

In operation, the bars 22 are slid endwise through the registering openings until the lugs 33 abut one wall and the lugs 27 have cleared the opposite wall. The lugs 27 will be tilted upwardV by the weight of the opposite ends of the bars 22 and the connector 31 therefor, and the bars 22 are elevated and locked in position by the inward movement of the bars 23.

` Each wedging bar has a flat upper surface 23, and a rounded lower surface 34, slidable in the rounded portions 23 of the lateral openings 24e, and tapered so as to compensate for the taper of the character bars. `Each wedge bar terminates at the free end in a laterally enlarged tang 37 similar to the tang- 36 of the bars 22.

To secure the bars 22 and 23 in gangs which will register with the lateral openingsl of the box, it is desirable that-they initially be assembled in the box and while so positioned securedV in gangs by cross pieces or handles 31 preferably having` longitudinal lips or flanges 35 arranged to extend over the tang ends of the elements. The handles and bars may be held inproper position while several holes 38 and i0 are drilledA through eachv gang and the cross pieces. Screws or bolts 4-1 passing through the apertures and held by nuts l2 permanently secure the several sets of bars tothe respective cross pieces. The assembly of the gangs of bars for a particular box may thus be suited to the alignment of the box openings without necessity for the accurate machining and drilling required to secure registry where the bars are assembled in gangs apart from the box.

By my improvements, the production of cores is greatly increased and their quality improved, since it will be understood that when the bars have once been assembled in gangs, the bars 22 may be quickly and simultaneously inserted and positioned in the box and then secured in place by the insertion simultaneously of the bars 23. rl`he bars 22 and 23, due to their complementary tapers, form moulding members of substantially uniform cross section across the cavities 12. The

cavities are then simultaneously filled with sash weight, the metal entering the core aper-v ture C forms a bridge'or cross bar having a fiat end bearing a character like the character 32 and the core portion B moulds the metal forming the walls of the eye to a curvature providing a non-abrading bearing for the sash cord.

Having described my invention, I claim:

Gore-forming apparatus comprising a box having a 'plurality of sets of core cavities, a

plurality of bars, each bar being insertable in a set of cavities, a connector for the bars and forming a handle for the manipulation thereof, a plurality of wedging bars adapted for engaging bars aforesaid for maintaining them in operative position, and a connector for the wedging bars forming al handle for the manipulation of the wedging bars.

Signed at Philadelphia, in the county of Philadelphia and State of Pennsylvania, this 25th dayof Oct., 1926.

THOMAS HAROLD BROWN. 

